I think you're going to find it's nothing fatal.
Good for you that you've changed to a more healthy diet!
Drink lots of water and get some exercise. I'm nearly 70 years old and go to the gym at least a few times a week. Makes me feel a lot better than when I'm sitting around.
You remind me of my son who usually decides whatever he gets will be fatal.
Take a breath....stress does not help.
I tell my son not to imagine the worst case scenario.....think horses, not zebras.
Take care of yourself and let us know what your doc says.... Good luck